OTY-025

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2011 Data

Legend

Graphs include Water Quality Objectives or thresholds(shown by bold red lines) where applicable.

ND- Not Detected (Value below minimum detection limits, results presented at minimum detection limit)

ns- Not Sampled

n/a- Not Available

MPN- Most Probable Number

BIN- Biological Index Number

>limit- Exceeds maximum measurable range

> Greater than

< Less than

References:

Water Quality Control Plan for the San Diego Basin, California Regional Water Quality Control Board, San Diego Region

US EPA criteria for lightly/moderately used freshwater areas were published in:

The Federal Register: Vol. 51, No. 45/Friday, March 7,1986/8012-8016

For all other procedures: http://sdwatersheds.org/wiki/Volunteer_Training

Water Quality Objectives for Chemical, Nutrient, Bacteria

and Toxicity Parameters by San Diego Coastkeeper

These are the limits used by regulatory agencies to show water quality impairment.

Water Quality Indicators

pH: < 6.5 or > 8.5

Dissolved Oxygen: < 5.0 mg/L

Total Phosphorous: PO₄-P > 0.1 mg/L

Nitrate: NO₃-N > 1 mg/L or N:P ratio > 10:1

Ammonia: NH₃-N > 0.025 mg/L

E. coli: > 406 per 100 mL

Enterococci: > 108 per 100 mL

Toxicity: BIN >= 4

Graphs Updated: January 18, 2011

2010 Data